Continuous Measurement of Three-Dimensional Root Canal Curvature Using Cone-Beam Computed and Micro-Computed Tomography: A Comparative Study
Continuous Measurement of Three-Dimensional Root Canal Curvature Using Cone-Beam Computed and Micro-Computed Tomography: A Comparative Study
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DOI：
10.3390/dj8010016
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发表时间：
2020-03-01
影响因子：
2.6
通讯作者：
Weber, Marie-Theres
中科院分区：
文献类型：
--
作者：
Kucher, Michael;Dannemann, Martin;Weber, Marie-Theres
根管弯曲的知识对于预防根管治疗过程中根管壁形成、根管穿孔和根管器械断裂的可能性至关重要。因此，根管曲率的量化方法以及诊断相关的断层三维（3D）成像数据的适用性是必要的。据此，锥形束计算机断层扫描（CBCT）图像和显微计算机断层扫描（μ CT）数据的远端根管的连续三维弯曲的人下颌磨牙（n = 50）进行了分析。通过对断层图像的评价，确定了根管三维中心线的曲率。每个根管切片的质心被识别和近似样条曲线，以获得中心线，因此，它的曲率。比较CBCT和mu CT图像评价的结果，确定的最小曲率半径分别为2.6 mm和2.1 mm。中心线的观察证明了CBCT和mu CT的三维成像数据对于可靠曲率分析的要求。总之，CBCT和mu CT图像的评价结果显示曲率半径相当。因此，将所介绍的方法与CBCT结合应用于患者病例可以提供重要的初步诊断步骤，以预防牙髓治疗并发症。
The knowledge of root canal curvature is crucial regarding the prevention of ledge formation, root perforation and the possibility of endodontic instruments' fracture during endodontic treatments. Therefore, a quantification method of the root canal curvature as well as the applicability of diagnostically relevant tomographic three-dimensional (3D) imaging data is necessary. Hereby, cone-beam computed tomography (CBCT) images and micro-computed tomography (mu CT) data of distal root canals were analysed concerning the continuous three-dimensional curvature of human mandibular molars (n = 50). The curvature of the canal's three-dimensional centre line was determined by evaluating the tomographic images. The centroids of each root canal slice were identified and approximated by spline curves to obtain the centre line and therefore, its curvature. Comparing the results evaluated from CBCT and mu CT images, minimum radii of curvature of 2.6 mm and 2.1 mm were determined, respectively. The observation of the centre line demonstrated the requirement of the three-dimensional imaging data from CBCT and mu CT for a reliable curvature analysis. Conclusively, the evaluation of CBCT and mu CT images results in comparable radii of curvature. Thus, the application of the introduced method in combination with CBCT applied to patient cases could offer an important preliminary diagnostical step to prevent endodontic treatment complications.